Engine-lathe.



No. 706,665. l Patented Aug. |2,-|902.

w. T. s. JOHNSON.

ENGINE LATHE.

(Application med Nov. 23. 1901.) (No Model.) 2v Sheets-Sheet l.

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Patented Aug. I2, |902.

W. -T. S. JOHNSON.

ENGINE LTIIE.`

(Application Med Nov. 23, 1901.)

2 sheets-sheet 2 (No MoQiel.)

ll/lllll/ TH: Hemus Pneus cn.. PNgT-uma. WASHINGTON, nA c.

UNITED STATES PATENT OFFICE.

WILLIAM T. S. JOHNSON, OF CINCINNATI, OHIO.

ENGINE-LATHE.

SPECIFICATION forming part of Letters Patent No. 706,665, dated August 12, 1902.

Application filed November 23, 1901. Serial No. 83,354. (No model.)

To all whom it may concern,.-

' Be it known that I, WILLIAM T. S.yJoHN SON, a citizen of the United States of America, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Engine-Lathes, of which the following is-a speciioation.

The object of my invention is both to simplify the means for varying the ratios between the rates of rotation of the live-spindle and the feed-rod or lead-screw and to enlarge the field of possible variations in said ratios. This object is attained by the means described in the specification and illustrated in the accompanying drawings, in which-' Figure lis a View in side elevation of as much of an engine-lathe as is necessary to illustrate my invention, showing the livespindle, cone-gear, lead-screw, and intermediate gearing. Fig. 2 is an end view of the same. Fig. 3 is a detail longitudinal section, upon an enlarged scale, of the gearing upon the end of the intermediate shaft for coupling it to the feed or lead-screw. Fig. 4 is a; central vertical longitudinal section taken upon line a; a: of Fig. 5, the back gearing being projected upward above ,thel parts standing in front of it. Fig. 5 is a transverse sectional view taken upon line 'y y of Fig. l. Figs; 6 and 7are detail views, upon an enlarged scale, of the spring-pins for coupling the pulley, the` disk secured upon the sleeve which carries the cone-gears, and the gear-wheel secured to the spindle.

In the drawings the. head-stock A, livespindle ct, the lead screw B, intermediate shaft O, between spindle a and screw B, shaft D, carrying the back gears, and one end of lathe-bed A only `are shown, since the tailstock, carriage, and their connections are of ordinary construction.

Upon spindle d, between its `journal-bearings a and a2 in the headfstock, a toothed wheelaais securedand along sleeve a4 is rotatably mounted. Upon sleeve a4 a cone of toothed Iwheels a5 and a disk d are secured, and a pulley a7, upon whose hub is secured a pinion d3, is rotatably mounted. Cone-gear a5 is shown with seven toothed wheels of gradually-increasing size; but the number the head-stock.

and sizes may be varied. Pulley 0.7 and wheel a3 carryflongitudinal spring-pins 01,9 and am, respectively, which may be pushed into perfora'tionaa11 in disk a to lock the disk to them.4 Shaft D is mounted eccentrically and carriesa large toothed wheel CZ and a small pinion d", so that by throwing handle cl2 wheel d may be made to mesh with pinion. a8 and pinion dt with wheel a3.

Shaft O is"'journaled adjacent to and parallel' to spindle a in brackets al? and als upon j A yoke c has two inwardlyprojecting perforated arms c c2 to slide upon shaft O, and between said arms a small toothed wheel c? is splined upon said shaft to rotate therewith and to have a longitudinal slipping motion thereon with the yoke, which at its upper end has two inwardly-projecting arms c4 c5, between which is journaled a toothed wheel o6, which is always in gear with wheel c3 and which by slipping the yoke along shaft O may be brought into gear with any one of the wheels of cone-gears d5.

Beneath shaft C projects a curved plate d, which is secured to or formed integral with thehead-stock and has in it a series of perforations 0,15, one of which comes in a line with leach of the toothed wheels of'fcone-gear d5. {Yoke c has at its lower end an inwardly-projecting spring-pin c7, which engages perforations @15in plate am to hold wheel c6 in'mesh with the wheel of the cone-gear'withwhich it has been placed in gear.-

Upon th'e projecting end of shaft C .are two loose` toothed wheels c8 o9 of different sizes, either of which may be made fast upon the shaft by means ot a sliding spline 019, seated in the shaftiand held upward by a spring C11. .Iournaled upon shaft C is likewise an adj ustable support E, which carries a stud-shaft e,

upon which are journaled two spur-wheels e. e2, which rotate together and oneof which is in mesh with wheel cs, the other with wheel ci. Wheel e2 meshes with a large gear-wheel b, secured upon the end of'leadscrew B. It is thus seen that the rate of rotation of leadscrew B bears one of two ratios to-that of intermediate shaftone ratio when wheel c9 is fast on shaft C and another when Wheel cs is fast thereon.

In operation when back gear D is out of IOO gear With toothed wheels a a8 pins a9 au? couple disk cts to pulley a7 and to toothed Wheel as. Disk ct rotates ycone-gear a5, and wheel a3 rotates spindle a at the same rate of rotation. It is seen that Without the back gear by simply moving yoke c along on shaft C and bringing Wheel ci into gear with the successive toothed Wheels of cone-gear a5 seven different rates of rotation relative to spindle d can be imparted to shaft C and that, therefore, by securing iirst wheel G9 and then o8 upon shaft C fourteen'different rates of rotation relative to the live-spindle can be imparted to the lead-screw. By disengaging pin d10 from disk a6, leaving pin ai in engagement therewith, and by throwing back gear ci d into gear with wheels as a3 fourteen additional different rates of rotation between the live-spindle and the lead-screw may be had, Leaving the back gear in gear, as just described, by disengaging pin a9 from disk a6 and pushing pin aointo engagement With said disk fourteen further additional rates of rotation of the lead-screw may be secured.

The convenience of a lathe of my invention in cutting screws is readily recognized, as by it screws of a great variety of pitch may be cut without any change of gear-wheels and with a minimum amount of adjustment of parts.

It is obvious that many mere mechanical variations may be made in mechanism shown without departing from the spirit or scope of my invention-as, for instance, in the variable-speed mechanism connecting the spindle and the intermediate shaft the cone-gearing might be secured to shaft C and the slipping yoke o and toothed Wheels c3 and c6 might be mounted upon spindle a in a manner similar to thatin which they are shown-mounted upon shaft C.

What I claim isl. In a lathe in combination with the bed, carriage, lead-screw and head-stock thereof, the live-spindle mounted in the head-stock, a sleeve mounted rotatably upon the spindle, a pinion, means for securing it upon the sleeve,

a gear-wheel secured to the spindle, means for coupling and uncoupling the sleeve with the spindle, back gear to be thrown into gear with the pinion on the sleeve and gear-wheel on the spindle when the sleeve and spindle are uncoupled from each other, means for throwing the back gear into gear with the sleeve and spindle and means for coupling the sleeve with the lead-screw, substantially as'shown and described.

2. In a lathe in combination with the bed, carriage, lead-screw and head-stockthereof, the live-spindle mounted in the head-stock, a sleeve mounted rotatably on the spindle, a driving-pulley and a toothed pinion mounted rotatably upon the sleeve, a plate or disk secured upon the sleeve, a gear-wheel secured upon the spindle, means for coupling the plate with both the pulley and with the gear-wheel on the spindle, back gear, means for throwthe live-spindle mounted in the head-stock, a

sleeve mounted rotatably upon the spindle, a pinion, means for securing it upon the sleeve, a gear-wheel secured to the spindle, means for coupling and uncoupling the sleeve with the-spindle, back gear to be thrown into gear with the pinion on the sleeve and the gear- Wheel on the spindle when the sleeve and the 'spindle are uncou pled from each other, means for throwing the back gear into gear with the sleeve and spindle, an intermediate shaft mounted in the head-stock adjacent to the livespindle, variable-speed mechanism coupling the sleeve and the intermediate shaft and means for coupling the intermediate shaft and the lead-screw, substantially as shown and described.

4. In a lathe in combination with the bed, carriage, lead-screw and head-stock thereof, the live-spindle mounted in thehead-stock, a sleeve mounted rotatably on the spindle, a driving-pulley and a toothed pinion mounted rotatably upon the sleeve, a plate or disk secured upon the sleeve, a gear-wheel secured upon the spindle, means for coupling and uncoupling the plate with both the pulley and with the gear-wheel on the spindle, back gear, means for throwingit into gear with the sleeve and the spindle, an intermediate shaft mounted in the head-stock adjacent to the live-spindle, variable-speed mechanism coupling the sleeve and the intermediate shaft and means for coupling the intermediate shaft and the lead-screw, substantially as shown and described.

5. In a lathe in combination with the bed1 carriage, lead-screw and head-stock thereof, the live-spindle mounted in the head-stock, a sleeve mounted rotatably upon the spindle, a pinion, means for securing it upon the sleeve, a gear-wheel secured to the spindle,

means for coupling and uncoupling the sleeveV gear with the pinion on the sleeve and the gear-wheel on the spindle when the sleeve and the spindle are uncoupled from each other, means for throwing the back gear into gear with the sleeve and spindle, variablesized toothed wheels secured upon the sleeve, `a shaft mounted in the head-stock adjacent to the live-spindle, a slipping yoke upon the shaft carrying gear-wheels to put the shaft in gear with one or another of the toothed wheels upon the sleeve and means for coupling the shaft and the lead-screw, substantially as shown and described. I

6. In a lathe in combination with the bed, carriage, lead-screw and head-stock thereof, the live-spindle mounted in the head-stock, a sleeve mounted rotatably on the spindle, a `driving-pulley having a toothed pinion secured to it and both mounted rotatably upon IOO IIO

IZO

the sleeve, a plate or disk secured upon the sleeve, a gear-Wheel secured upon the spindle, means for coupling and uncoupling the plate With both the pulley and with the gear-wheel on the spindle, back gear, means for throwing it into gear with the sleeve and the spindle, variable-sized toothed Wheels secured upon the sleeve, a shaft mounted in the headstock adjacent to the live-spindle, a slipping yoke upon the shaft carrying gear-wheels to put the shaft in gear with one or another of the toothed wheels upon the sleeve and means for coupling the shaft and the lead-screw, substantially as shown and described.

7. In a lathe in combination with the bed, carriage, lead-screw and head-stock thereof, the live-spindle mounted in the head-stock,

an intermediate shaft mounted in the headstock adjacent to the live-spindle, variablespeed` mechanism coupling the spindle and the intermediate shaft, loose pinions mounted upon the end of the shaft, a sliding spline for making any one of said pinions fast on the shaft, an adjustable support carrying a number ot gear-wheels secured to one another and each in mesh With one of the pinions on the shaft, and a gear-Wheel on the lead-screw in mesh with one of the gear-Wheels of the adjustable support, substantially as shown and described.

` WILLAM T. S. JOHNSON.

Witnesses:

W. F. MURRAY, EMMA LYFORD. 

